package com.ransj.ndkpath.gles;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;

import android.opengl.GLSurfaceView;
import android.util.Log;

public class GL_ConfigChooser implements GLSurfaceView.EGLConfigChooser{
	private static final String TAG = GL_ConfigChooser.class.getSimpleName();
	private static final boolean DEBUG = true;
    /* This EGL config specification is used to specify 2.0 rendering.
     * We use a minimum size of 4 bits for red/green/blue, but will
     * perform actual matching in chooseConfig() below.
     */
    private static int EGL_OPENGL_ES2_BIT = 4;
    private static int[] s_configAttribs2 =
    {
        EGL10.EGL_RED_SIZE, 4,
        EGL10.EGL_GREEN_SIZE, 4,
        EGL10.EGL_BLUE_SIZE, 4,
        EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL10.EGL_NONE
    };
    
    private static final int[] attributes = {
            EGL10.EGL_BUFFER_SIZE,
            EGL10.EGL_ALPHA_SIZE,
            EGL10.EGL_BLUE_SIZE,
            EGL10.EGL_GREEN_SIZE,
            EGL10.EGL_RED_SIZE,
            EGL10.EGL_DEPTH_SIZE,
            EGL10.EGL_STENCIL_SIZE,
            EGL10.EGL_CONFIG_CAVEAT,
            EGL10.EGL_CONFIG_ID,
            EGL10.EGL_LEVEL,
            EGL10.EGL_MAX_PBUFFER_HEIGHT,
            EGL10.EGL_MAX_PBUFFER_PIXELS,
            EGL10.EGL_MAX_PBUFFER_WIDTH,
            EGL10.EGL_NATIVE_RENDERABLE,
            EGL10.EGL_NATIVE_VISUAL_ID,
            EGL10.EGL_NATIVE_VISUAL_TYPE,
            0x3030, // EGL10.EGL_PRESERVED_RESOURCES,
            EGL10.EGL_SAMPLES,
            EGL10.EGL_SAMPLE_BUFFERS,
            EGL10.EGL_SURFACE_TYPE,
            EGL10.EGL_TRANSPARENT_TYPE,
            EGL10.EGL_TRANSPARENT_RED_VALUE,
            EGL10.EGL_TRANSPARENT_GREEN_VALUE,
            EGL10.EGL_TRANSPARENT_BLUE_VALUE,
            0x3039, // EGL10.EGL_BIND_TO_TEXTURE_RGB,
            0x303A, // EGL10.EGL_BIND_TO_TEXTURE_RGBA,
            0x303B, // EGL10.EGL_MIN_SWAP_INTERVAL,
            0x303C, // EGL10.EGL_MAX_SWAP_INTERVAL,
            EGL10.EGL_LUMINANCE_SIZE,
            EGL10.EGL_ALPHA_MASK_SIZE,
            EGL10.EGL_COLOR_BUFFER_TYPE,
            EGL10.EGL_RENDERABLE_TYPE,
            0x3042 // EGL10.EGL_CONFORMANT
    };
    private static final String[] names = {
            "EGL_BUFFER_SIZE",
            "EGL_ALPHA_SIZE",
            "EGL_BLUE_SIZE",
            "EGL_GREEN_SIZE",
            "EGL_RED_SIZE",
            "EGL_DEPTH_SIZE",
            "EGL_STENCIL_SIZE",
            "EGL_CONFIG_CAVEAT",
            "EGL_CONFIG_ID",
            "EGL_LEVEL",
            "EGL_MAX_PBUFFER_HEIGHT",
            "EGL_MAX_PBUFFER_PIXELS",
            "EGL_MAX_PBUFFER_WIDTH",
            "EGL_NATIVE_RENDERABLE",
            "EGL_NATIVE_VISUAL_ID",
            "EGL_NATIVE_VISUAL_TYPE",
            "EGL_PRESERVED_RESOURCES",
            "EGL_SAMPLES",
            "EGL_SAMPLE_BUFFERS",
            "EGL_SURFACE_TYPE",
            "EGL_TRANSPARENT_TYPE",
            "EGL_TRANSPARENT_RED_VALUE",
            "EGL_TRANSPARENT_GREEN_VALUE",
            "EGL_TRANSPARENT_BLUE_VALUE",
            "EGL_BIND_TO_TEXTURE_RGB",
            "EGL_BIND_TO_TEXTURE_RGBA",
            "EGL_MIN_SWAP_INTERVAL",
            "EGL_MAX_SWAP_INTERVAL",
            "EGL_LUMINANCE_SIZE",
            "EGL_ALPHA_MASK_SIZE",
            "EGL_COLOR_BUFFER_TYPE",
            "EGL_RENDERABLE_TYPE",
            "EGL_CONFORMANT"
    };
    // Subclasses can adjust these values:
    protected int mRedSize;
    protected int mGreenSize;
    protected int mBlueSize;
    protected int mAlphaSize;
    protected int mDepthSize;
    protected int mStencilSize;
    private int[] mValue = new int[1];
    /**
     * 
     * @param r
     * @param g
     * @param b
     * @param a
     * @param depth
     * @param stencil
     */
    public GL_ConfigChooser(int r,int g,int b,int a,int depth,int stencil){
    	mRedSize = r;
    	mGreenSize = g;
    	mBlueSize = b;
    	mDepthSize = depth;
    	mStencilSize= stencil;
    }
    
	@Override
	public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
		int[] num_config = new int[1];
		egl.eglChooseConfig(display, s_configAttribs2, null, 0, num_config);
		int num = num_config[0];
		if(num<0){
			throw new RuntimeException("No configs match configSpec");
		}
		EGLConfig configs[] =new EGLConfig[num];
		egl.eglChooseConfig(display, s_configAttribs2, configs, num, num_config);
		if(DEBUG){
			printConfigs(egl, display, configs);
		}
		return chooseConfig(egl, display, configs);
	}
	
    public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display,
            EGLConfig[] configs) {
        for(EGLConfig config : configs) {
            int d = findConfigAttrib(egl, display, config,
                    EGL10.EGL_DEPTH_SIZE, 0);
            int s = findConfigAttrib(egl, display, config,
                    EGL10.EGL_STENCIL_SIZE, 0);

            // We need at least mDepthSize and mStencilSize bits
            if (d < mDepthSize || s < mStencilSize)
                continue;

            // We want an *exact* match for red/green/blue/alpha
            int r = findConfigAttrib(egl, display, config,
                    EGL10.EGL_RED_SIZE, 0);
            int g = findConfigAttrib(egl, display, config,
                        EGL10.EGL_GREEN_SIZE, 0);
            int b = findConfigAttrib(egl, display, config,
                        EGL10.EGL_BLUE_SIZE, 0);
            int a = findConfigAttrib(egl, display, config,
                    EGL10.EGL_ALPHA_SIZE, 0);

            if (r == mRedSize && g == mGreenSize && b == mBlueSize && a == mAlphaSize)
                return config;
        }
        return null;
    }
    
    private int findConfigAttrib(EGL10 egl, EGLDisplay display,
            EGLConfig config, int attribute, int defaultValue) {

        if (egl.eglGetConfigAttrib(display, config, attribute, mValue)) {
            return mValue[0];
        }
        return defaultValue;
    }
	
    private void printConfigs(EGL10 egl, EGLDisplay display,
            EGLConfig[] configs) {
            int numConfigs = configs.length;
            Log.w(TAG, String.format("%d configurations", numConfigs));
            for (int i = 0; i < numConfigs; i++) {
                Log.w(TAG, String.format("Configuration %d:\n", i));
                printConfig(egl, display, configs[i]);
            }
        }

        private void printConfig(EGL10 egl, EGLDisplay display,
                EGLConfig config) {
            int[] value = new int[1];
            for (int i = 0; i < attributes.length; i++) {
                int attribute = attributes[i];
                String name = names[i];
                if ( egl.eglGetConfigAttrib(display, config, attribute, value)) {
                    Log.w(TAG, String.format("  %s: %d\n", name, value[0]));
                } else {
                    // Log.w(TAG, String.format("  %s: failed\n", name));
                    while (egl.eglGetError() != EGL10.EGL_SUCCESS);
                }
            }
        }
}
